Late Neoarchean-Late Paleoproterozoic Magmato-Tectonothermal Events in the Xiaoqinling Area, Southern Margin of the North China Craton, as Documented by Zircon U-Pb-Hf Isotope Analyses and Whole-Rock Geochemistry
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摘要: 为了探讨华北克拉通南缘早前寒武纪形成演化，对华北克拉通南缘小秦岭地区早前寒武纪变质基底花岗质片麻岩开展了SHRIMP U-Pb锆石定年、Hf同位素组成及地球化学组成研究，获得了2个TTG片麻岩样品~2.50 Ga的岩浆锆石年龄和时代相近的变质锆石年龄，岩浆锆石εHf（t）值为0.71~4.37；1个花岗质片麻岩样品的岩浆锆石年龄为~2.30 Ga，εHf（t）值为－1.21~0.11.它们也记录了古元古代晚期变质锆石年龄或显示古元古代晚期构造热事件影响的存在.岩石以轻重稀土强烈分异为特征，大离子亲石元素相对富集，Nb、P、Ti相对亏损.在小秦岭地区首次发现新太古代晚期TTG岩石，并识别出新太古代晚期构造热事件.现有资料支持华北克拉通南缘与华北克拉通其他地区具有类似的早前寒武纪形成演化历史的认识.但是，华北克拉通南缘以2.3 Ga左右岩浆作用十分发育而显示出独特性.Abstract: This paper reports SHRIMP U-Pb dating results and MC-ICPMS Hf isotopes of zircons as well as whole-rock geochemical compositions on granitoidic rocks from the early Precambrian basement in the Xiaoqinling area, southern margin of the North China Craton. Two TTG gneiss samples have ~2.50 Ga and slightly younger ages for magmatic and metamorphic zircons, respectively, with magmatic zircons having εHf(t) values of 0.71 to 4.37. One granitic gneiss sample has a magmatic zircon age of ~2.30 Ga and εHf(t) values of -1.21 to 0.11. All samples have recorded late Paleoproterozoic metamorphic ages or the influence of the event. The rocks are similar in element composition, showing strong light to heavy REE differentiation and enrichment in LILE and depletion in Nb, P and Ti. Combined with early work, the identification of late Neoarchean TTG rocks and tectonothermal event support the conclusion that the southern margin of the North China Craton is similar in early Precambrian geological history to others all over the craton. However, the former shows its peculiarity in widespread developement of ~2.3 Ga magmatism.
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Key words:
- late Neoarchean /
- TTG /
- tectonothermal event /
- Xiaoqinling /
- southern margin of the North China Craton /
- geochemistry
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图 1 华北克拉通南缘小秦岭地区地质图（据王国栋等，2012修改）
Fig. 1. Geological map of the Xiaoqinling area, southern margin of the North China Craton (modified after Wang et al., 2012)
图 2 小秦岭地区太华杂岩中的花岗质片麻岩的野外照片
a、b. 2.5 Ga奥长花岗质片麻岩（SX1201）；c、d. 2.3 Ga花岗质片麻岩（SX1202）；e、f. 2.5 Ga花岗质片麻岩（SX1203）
Fig. 2. Field photos of granitoidic gneisses from the Taihua Complex in the Xiaoqinling area
图 3 小秦岭地区太华杂岩中的花岗质片麻岩的岩相学照片
a、b. 2.5 Ga奥长花岗质片麻岩（SX1201）；c. 2.3 Ga花岗质片麻岩（SX1202）；d. 2.5 Ga花岗质片麻岩（SX1203）. Pl.斜长石；Q.石英；Bi.黑云母；Ep.绿帘石；Hbl.角闪石
Fig. 3. Petrographic photos of granitoidic gneisses from the Taihua Complex in the Xiaoqinling area
图 4 小秦岭地区太华杂岩中的花岗质片麻岩的锆石阴极发光图像
a、b. 2.5 Ga奥长花岗质片麻岩（SX1201）；c、d. 2.3 Ga花岗质片麻岩（SX1202）；e、f. 2.5 Ga花岗质片麻岩（SX1203）.实线椭圆为离子探针分析点，虚线圆为Hf分析点.图中给出了n(207Pb)/n(206Pb)年龄和εHf(t)值. MA、RC和R分别为岩浆锆石、重结晶锆石和变质增生边
Fig. 4. Cathodoluminescence images of zircons from granitoidic gneisses from the Taihua Complex in the Xiaoqinling area
图 5 小秦岭地区太华杂岩中的花岗质片麻岩的锆石U-Pb谐和图
a. 2.5 Ga奥长花岗质片麻岩（SX1201）；b. 2.3 Ga花岗质片麻岩（SX1202）；c. 2.5 Ga花岗质片麻岩（SX1203）
Fig. 5. Concordia diagrams of zircon SHRIMP U-Pb data for granitoidic gneisses from the Taihua Complex in the Xiaoqinling area
图 6 小秦岭地区太华杂岩中的花岗质片麻岩的锆石年龄-εHf(t)图解
Fig. 6. Age vs. εHf(t) diagram for zircons from granitoidic gneisses from the Taihua complex in the Xiaoqinling area
图 7 小秦岭地区太华杂岩中的花岗质片麻岩的锆石Hf同位素二阶段模式年龄直方图
Fig. 7. Zircon Hf two-stage model age histograms for granitoidic gneisses from the Taihua Complex in the Xiaoqinling area
图 8 小秦岭地区太华杂岩中花岗质片麻岩的An-Ab-Or图解
Fig. 8. An-Ab-Or diagram of granitic gneisses from the Taihua Complex in the Xiaoqinling area
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